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What is the primary function of the Main Entrance Door (MED) on the aircraft?
It is the primary means of passenger and crew access to the interior of the aircraft cabin.
How is the status of the aircraft doors indicated to the flight crew?
The door status regarding open or closed status is indicated to the flight crew via the Crew Alerting System (CAS) messages.
What are the different sections into which aircraft doors are divided?
Main Entrance Door, Emergency Exits, Baggage Compartment Doors, Tail Compartment Door, Service Doors, Security System
What are the components of the door structure of the MED?
aluminum frame and stressed skins
What prevents the MED from opening in flight?
system interlocks (fail-safes)
How is the door controlled from the cockpit overhead panel?
lighted, momentary pushbutton DOOR OPEN switch
What is the term used to refer to the locking pin engagement in the detent of the latching mechanism?
Locked
How is the visual locked indication displayed on the locked indication flag above the left bayonet?
A single orange dot
What is used to control the opening and closing final positions of the door, and how are they controlled?
A series of hard stops; controlled by a series of hard stops located on the door and the fuselage
What is the purpose of the pressure relief valve in the MED door system?
To prevent pressure from building up to an unsafe level until the door is fully latched and locked, and to prevent the door from becoming unlocked when the cabin is pressurized to two psi or greater.
How is emergency access to the cabin through the main entry door initiated using the Emergency Entry Switch?
By a momentary selection to OPEN (upward direction).
What happens when the MED is not fully closed, latched, and locked?
The 'DOOR OPEN' text on the indicator below the external MED control switch is illuminated.
What is the purpose of the damper cylinder in relation to the Main Entrance Door (MED)?
It provides controlled opening of the MED as it extends and assists in regulating door speed.
What is the consequence of removing or disconnecting the MED closed circuit damper?
There will be no restricted damping to oppose the weight of the door during opening, potentially resulting in serious injury to personnel or damage to the door and airplane if the door is allowed to free-fall to the open position.
How is the position of the aircraft doors indicated to the flight crew, and what system enables this indication?
The position of the aircraft doors is indicated to the flight crew through the MAU Monitor and Warning System (MWS) which generates appropriate CAS messages and prompts a visual indication on the Doors synoptic window.
What illuminates amber when the MED is not fully closed?
Light
What is the primary function of the DOOR OPEN legend?
Indicates open logic energized
How is the MED to be opened on the first flight of the day?
Using only electrical power from the Fwd Erner Battery
What initiates the door opening sequence from outside the aircraft?
Momentarily holding the switch to OPEN
In what cases is the MED not considered an emergency exit?
Water landing (ditching)
What type of hinges are used to hinge the door to the fuselage structure?
gooseneck hinges
What are the two systems outlined for the MED's electrical architecture?
Primary System: Uses the existing Secondary Power Distribution System (SPDS) for control and power switching; Backup System: Enables the MED to be opened in the event of a minor crash condition
What interlocks prevent the MED from opening in flight?
SPDS and MAU interlocks
What is the primary function of the Main Entrance Door (MED) on the aircraft?
The primary function of the Main Entrance Door (MED) is to provide the primary means of passenger and crew access to the interior of the aircraft cabin.
How is the status of the aircraft doors indicated to the flight crew?
The status of the aircraft doors, regarding open or closed status, is indicated to the flight crew via the Crew Alerting System (CAS) messages.
What are the different sections into which aircraft doors are divided?
Aircraft doors are divided into the following sections: Main Entrance Door, Emergency Exits, Baggage Compartment Doors, Tail Compartment Door, Service Doors, and Security System.
What is the purpose of the Emergency Entry Switch located at the bottom of the exterior of the Main Entrance Door (MED)?
Initiate door open on primary aircraft power or eBATT power for emergency access to the cabin.
How is the latched position of the Main Entrance Door (MED) visually verified from the inside?
By a triangular-shaped three orange dot configuration visible on each bayonet.
What is the function of the pressure relief valve in the MED door system?
To prevent pressure build-up to an unsafe level and to ensure the door does not become unlocked when the cabin is pressurized to two psi or greater.
What is the purpose of the restrictor installed in the door actuator line?
Regulating door speed
Describe the consequences of removing or disconnecting the MED closed circuit damper.
No restricted damping to oppose the weight of the door during opening
How is the position of open doors indicated to the flight crew, and what system enables this indication?
MAU Monitor and Warning System (MWS)
What is the primary purpose of the MED OPERATOR'S INDICATION light?
To illuminate amber when the MED is not fully closed and extinguish when closing operations are complete. It also has push-to-test functionality to verify that the bulb is not burned out.
How is the opening sequence of the main entrance door (MED) initiated from outside the aircraft?
Momentarily holding the switch to OPEN will initiate the door opening sequence.
What are the two types of emergency exits installed on the aircraft?
Removable Cabin Emergency Exit Doors (EEDs) and the Main Entrance Door (MED).
What is the procedure for unlocking the removable cabin emergency exit doors (EEDs) from the inside?
The EEDs are first unlocked by opening the latches located above the EEDs by pulling the release handle and then extracted inward with handles on the upper and lower sides.
What is the primary function of the Main Entrance Door (MED) in emergency situations?
The MED is an emergency exit for all normal and abnormal landing cases except for a water landing (ditching).
What are the specific locations and functions of the proximity switches in the MED latching and locking mechanism?
The three proximity switches are located on the MED latching and locking mechanism and send a 'door open' signal to the cabin pressure system, preventing cabin pressurization until the MED is fully closed, latched, and locked.
How is the MED hydraulic system designed to control the opening and closing of the door?
The MED hydraulic system consists of a selector valve, pressure restrictor valve, actuating and damper cylinders. The door closes by means of an electrically-controlled but hydraulically-actuated system, and it opens using a closed-circuit damper cylinder that generates a controlled free-fall.
What is the procedure for manually unlocking and unlatching the MED in the event of an internal door component failure, and how does it vary between different airplane S/Ns?
For Airplane S/Ns 6001-6249 not having ASC 065, manual operation is not normally undertaken by aircrew members and detailed instructions can be found in the Aircraft Maintenance Manual (AMM), 52-10-00 Main Entrance Door. For Airplane S/Ns 6001-6249 having ASC 065 and 6250 and subsequent, a magnetically-secured treadplate panel allows for access to manual operation mechanisms.
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